INDEX 381 



Echinoderms, morphology of, 248. 



Ectoderm, 177. 



Effector organs, 158, 271. 



Elan vital, 161. 



Electromagnetism, 355. 



Electrons, 304, 355. 



Elimination, natural, 229. 



Embryological stages compared with physical phases, 308. 



Embryology, 127 ; 



hypotheses of, 128; physical hypotheses fail, 128 ; experimental, 128; 

 suggests phylogenetic history, 213. 



Emulsoids, 108. 



Endoskeleton, 177, 276. 



Energetics, first law of, 51 ; 

 second law of, 113. 



Energy, 356 ; 



available and unavailable, 55 ; biotic, 325 ; chemical, 61 ; and causation, 

 54 ; degradation of, 63 ; dissipation of, 53 ; electrical, 61 ; forms of, 

 325 ; kinetic, 52, 357 ; mechanical, 60, 61 ; potential, 53, 358 ; of posi- 

 tion, 360. 



Energy-transformations, 54, 371 ; 



anabolic, 89 ; in the animal, 70 ; compensatory, 88 ; compensatory 

 organic, 268; irreversible, 59 ; in physical mechanisms, 58 ; in the plant, 71. 



Engelmann, and the artificial muscle, 105. 



Entelechy, 161, 318 ; 



not energy, 329 ; is power of direction, 329 ; not spatial but acts into 

 space. 330 ; an intensive manifoldness, 330 ; is arrangement, 323 ; 

 involves regulations, 323 ; arrests inorganic happening, 327 ; initiates 

 chemical happening, 327 ; compared with enzyme action, 327 ; illustrated 

 by analogy, 322. 



Entropy, 54 ; 



augmentation of, 75 ; and Carnot engine, 369. 



Environment, does not select variations, 235 ; 

 made by the organism, 236. 



Enzymes, 90 ; 



nature of, 92 ; pancreatic, 93 ; reversible, 93 ; activation of, 92. 



Enzyme activity, 93. 



Epigenesis in development, 129. 



Equilibrium, chemical, 102. 

 false, 86, 151. 



Ether of space, 46, 304, 361 ; 



potential energy resides in, 361. 



Evolution 



tendencies of, 252, 264, 276, 295 ; separation of tendencies, 296 ; a trans- 

 formation of intensive into extensive manifoldness, 309 ; a dissociation 

 of tendencies originally coalescent, 305 ; increases diversity, 310 ; 

 segregates energy, 311 ; compared with permutations and combinations, 



